Dog Bladder Stones: Symptoms, Causes, and What to Do Next

Discovering that your dog might have bladder stones can feel alarming, especially when you notice something is clearly wrong but aren’t quite sure what’s causing it. You’re not alone in this — bladder stones are one of the more common urinary conditions seen in dogs of all ages and breeds. Understanding what to look for and what steps to take can make all the difference for your dog’s comfort and long-term health.

Common Causes

Bladder stones, also known as uroliths or urinary calculi, form when minerals in your dog’s urine crystallize and clump together over time. These hard mineral deposits can vary in size from tiny sand-like granules to stones large enough to cause serious obstruction. Several factors can contribute to their development, and in many cases, it’s a combination of things rather than a single cause.

The most common contributing factors include:

• Diet and mineral imbalances — Diets high in certain minerals like calcium, magnesium, phosphorus, or oxalate can increase the risk of stone formation, particularly if your dog isn’t drinking enough water to flush the urinary system regularly.
• Urinary tract infections (UTIs) — Bacterial infections are a leading cause of struvite stones, the most common type found in dogs. The bacteria alter the chemistry of the urine in ways that encourage mineral deposits to form.
• Genetics and breed predisposition — Certain breeds, including Dalmatians, Miniature Schnauzers, Bichon Frises, and Shih Tzus, are genetically more prone to developing specific types of bladder stones.
• Urine pH imbalances — Urine that is consistently too acidic or too alkaline creates an environment where different types of crystals can form more easily.
• Inadequate water intake — Dogs that don’t drink enough water produce more concentrated urine, which makes it easier for minerals to accumulate and solidify over time.

It’s worth knowing that not all bladder stones are the same, and the type matters enormously when it comes to treatment. Struvite stones — made of magnesium ammonium phosphate — are typically linked to bacterial UTIs and tend to form in alkaline urine. Calcium oxalate stones, on the other hand, form in more acidic urine and are strongly influenced by genetics and diet. Urate stones, which are common in Dalmatians due to a specific metabolic quirk, form because of abnormal purine metabolism rather than infection. Your veterinarian will often try to determine the stone type through imaging, urinalysis, and sometimes stone analysis after removal, because treating the wrong type with the wrong approach can actually make things worse.

Age and sex can also play a role. Middle-aged to older dogs are diagnosed with bladder stones more frequently than puppies, likely because years of dietary habits and subtle metabolic changes accumulate over time. Interestingly, struvite stones are more common in female dogs — likely because females are more prone to UTIs due to their shorter urethras. Calcium oxalate stones, by contrast, tend to show up more in male dogs and in neutered animals of both sexes. There’s no single rule that applies to every dog, but understanding these patterns helps your vet narrow down the diagnosis more efficiently.

Diagnosing the underlying cause typically starts with a urinalysis to check urine pH, the presence of crystals, signs of infection, and blood. A urine culture may be performed if a bacterial infection is suspected. X-rays are effective for detecting calcium oxalate and struvite stones, which are radiodense, while ultrasound may be needed to spot stones that don’t show up clearly on X-rays. In some cases, a stone that has been passed or surgically removed will be sent to a laboratory for mineral analysis — the most definitive way to identify the stone type and guide long-term prevention.

Symptoms to Watch For

One of the tricky things about bladder stones in dogs is that symptoms can range from subtle to quite severe depending on the size, number, and location of the stones. Some dogs show signs early, while others seem fine until a stone causes a blockage — which is a medical emergency. Knowing what to watch for helps you act quickly when it matters most.

Common symptoms of bladder stones in dogs include:

• Frequent urination or straining to urinate — Your dog may squat or lift a leg repeatedly with little to no urine coming out, which is often one of the first noticeable signs.
• Blood in the urine (hematuria) — Urine that appears pink, red, or brown is a clear signal that something is irritating or damaging the lining of the urinary tract.
• Cloudy or foul-smelling urine — This can indicate an accompanying urinary tract infection, which often occurs alongside bladder stones.
• Crying out or whimpering during urination — Pain during urination is a strong indicator that stones are causing significant irritation or partial blockage.
• Licking at the genitals — Dogs often try to soothe discomfort by licking the area around the urinary opening more than usual.
• Accidents in the house — A previously house-trained dog suddenly having indoor accidents may be struggling with urgency caused by bladder irritation.
• Lethargy, loss of appetite, or vomiting — These more serious symptoms can indicate a urinary blockage, which requires immediate veterinary attention.

If your dog is unable to urinate at all, treat this as an emergency and seek veterinary care right away.

Symptom Severity at a Glance

Symptom	Risk Level	Action Required
Occasional licking at genitals	Mild	Monitor closely for 24 hours; note any changes
Accidents in the house	Mild	Schedule a vet appointment within a few days
Cloudy or foul-smelling urine	Moderate	Call your vet within 24 hours
Blood in the urine	Moderate	Call your vet within 24 hours
Straining or crying during urination	Serious	Contact your vet today
Straining with little or no urine output	Serious	Seek emergency care immediately
Lethargy, vomiting, or complete inability to urinate	Serious	Seek emergency care immediately

Breeds Most at Risk

While any dog can develop bladder stones, some breeds carry a significantly higher genetic risk and benefit from closer monitoring throughout their lives.

Dalmatians have a well-documented genetic mutation that affects how they metabolize purines, leading to abnormally high levels of uric acid in their urine. This makes urate stones a breed-defining concern rather than a rare occurrence. Dalmatian owners are often advised to feed low-purine diets and ensure consistent, high water intake as a preventive measure from an early age.

Miniature Schnauzers are one of the breeds most commonly diagnosed with calcium oxalate stones, with a genetic predisposition that appears to affect how their kidneys regulate calcium excretion. They also tend to develop struvite stones, making them somewhat uniquely vulnerable to multiple stone types. Regular urinalysis screenings are often recommended for this breed even when symptoms aren’t present.

Bichon Frises and Shih Tzus are both over-represented in bladder stone diagnoses, particularly for calcium oxalate and struvite stones respectively. The exact mechanisms aren’t fully understood in all cases, but both breeds appear to have metabolic tendencies that make their urine chemistry more favorable to stone formation. If you own one of these breeds, it’s worth discussing preventive screening with your vet before any symptoms appear.

What You Can Do at Home

While bladder stones ultimately require professional diagnosis and treatment, there are a few supportive steps you can take at home while you arrange veterinary care. These measures won’t dissolve or remove the stones, but they can help keep your dog more comfortable and prevent the situation from worsening.

The most important thing you can do is encourage your dog to drink more water. Increased water intake helps dilute the urine and may reduce further irritation. Try offering fresh, clean water frequently throughout the day, and consider adding a pet water fountain, which many dogs find more enticing than a still water bowl. If your dog eats dry kibble exclusively, you might also mix in a small amount of low-sodium broth or warm water to boost fluid intake.

Avoid giving your dog any supplements, vitamins, or dietary changes without veterinary guidance, as certain minerals can actually worsen stone formation depending on the type of stones present. Keep your dog calm and comfortable, limit strenuous exercise, and monitor their urination closely. Note how often they’re attempting to urinate, whether any urine is produced, and whether you see any blood. This information will be invaluable to your veterinarian.

When to See a Vet

You should contact your veterinarian as soon as you notice any urinary symptoms in your dog, even if they seem mild. Bladder stones do not resolve on their own, and early diagnosis leads to better outcomes and less discomfort for your dog overall.

Seek immediate emergency veterinary care if your dog is unable to urinate, is crying out in pain, seems extremely lethargic, or is vomiting alongside urinary symptoms. A complete urinary blockage can become life-threatening within hours and must be treated as an urgent medical emergency.

Your vet will likely recommend diagnostic imaging such as X-rays or an ultrasound to confirm the presence of stones, along with a urinalysis and possibly a urine culture to check for infection. Treatment options depend on the type and severity of the stones and may include a prescription dissolution diet, medication, non-surgical procedures like urohydropropulsion, or surgical removal. Your vet will walk you through the best path forward based on your dog’s specific situation.

How Pet Insurance Can Help

Diagnosing and treating bladder stones can involve imaging, lab work, prescription diets, medications, and potentially surgery — costs that can add up quickly and catch pet owners off guard. Having a pet insurance plan in place before your dog becomes ill means you can focus on getting your dog the care they need rather than stressing over the bill.

Protective Care: Get a free pet insurance quote and protect your dog today

For times when you need immediate guidance from a licensed veterinarian without leaving home, telehealth services can be a lifesaver.

For more clinical details on canine health, you can refer to the professional guidelines from the Merck Veterinary Manual.

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Bladder stones are a serious condition, but with prompt attention and the right care, most dogs recover well and go on to live happy, comfortable lives. Trust your instincts — if something feels off with your dog, it’s always worth making that call to your vet. You know your dog better than anyone, and acting early is one of the best things you can do for them.